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      <a id="streson"></a>
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        <h2>
          <span class="refentrytitle">streson</span>
        </h2>
        <p>streson — 
      A string resonator with variable fundamental frequency.
          </p>
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      <div class="refsect1">
        <a id="idp153467632"></a>
        <h2>Description</h2>
        <p>
      An audio signal is modified by a string resonator with variable fundamental frequency.
    </p>
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      <div class="refsect1">
        <a id="idp153478464"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">ares <span class="command"><strong>streson</strong></span> asig, kfr, ifdbgain</pre>
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      <div class="refsect1">
        <a id="idp153480592"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>ifdbgain</em></span> -- feedback gain, between 0 and 1, of the internal delay line. A value close to 1 creates a slower decay and a more pronounced resonance. Small values may leave the input signal unaffected. Depending on the filter frequency, typical values are &gt; .9.
    </p>
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      <div class="refsect1">
        <a id="idp153532736"></a>
        <h2>Performance</h2>
        <p>
      <span class="emphasis"><em>asig</em></span> -- the input audio signal.
    </p>
        <p>
      <span class="emphasis"><em>kfr</em></span> -- the fundamental frequency of the string.
    </p>
        <p>
      <span class="emphasis"><em>streson</em></span> passes the input <span class="emphasis"><em>asig</em></span> through a network composed of comb, low-pass and all-pass filters, similar to the one used in some versions of the Karplus-Strong algorithm, creating a string resonator effect. The fundamental frequency of the <span class="quote">“<span class="quote">string</span>”</span> is controlled by the k-rate variable <span class="emphasis"><em>kfr</em></span>.This opcode can be used to simulate sympathetic resonances to an input signal.
    </p>
        <p>
      See <a class="link" href="MiscModalFreq.html" title="Appendix E. Modal Frequency Ratios"><em class="citetitle">Modal Frequency Ratios</em></a> for frequency ratios of real intruments which can be used to determine the values of <span class="emphasis"><em>kfrq</em></span>.
    </p>
        <p>
      <span class="emphasis"><em>streson</em></span> is an adaptation of the StringFlt object of the SndObj Sound Object Library developed by the author.
    </p>
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      <div class="refsect1">
        <a id="idp153540704"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the streson opcode. It uses the file <a class="ulink" href="examples/streson.csd" target="_top"><em class="citetitle">streson.csd</em></a>.
      </p>
        <div class="example">
          <a id="idp153542480"></a>
          <p class="title">
            <strong>Example 875. Example of the streson opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac  <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o streson.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100 
<span class="ohdr">ksmps</span> <span class="op">=</span> 32 
<span class="ohdr">0dbfs</span>  <span class="op">=</span> 1 
<span class="ohdr">nchnls</span> <span class="op">=</span> 2

<span class="oblock">instr</span> 1

asig <span class="opc">diskin2</span> "fox.wav", 1, 0, 1
 
kfr <span class="op">=</span> p4
ifdbgain <span class="op">=</span> 0.90

astr <span class="opc">streson</span> asig, kfr, ifdbgain
asig <span class="opc">clip</span> astr, 0, 1
     <span class="opc">outs</span> asig, asig

<span class="oblock">endin</span>
<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>

<span class="stamnt">i</span> 1 0 1 20
<span class="stamnt">i</span> 1 + . &gt;
<span class="stamnt">i</span> 1 + . &gt;
<span class="stamnt">i</span> 1 + . &gt;
<span class="stamnt">i</span> 1 + . &gt;
<span class="stamnt">i</span> 1 + . &gt;
<span class="stamnt">i</span> 1 + . 1000
<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
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        <p><br class="example-break" />
    </p>
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      <div class="refsect1">
        <a id="idp153546768"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Victor Lazzarini</td>
          </tr>
          <tr>
            <td>Music Department</td>
          </tr>
          <tr>
            <td>National University of Ireland, Maynooth</td>
          </tr>
          <tr>
            <td>Maynooth, Co. Kildare</td>
          </tr>
          <tr>
            <td>1998</td>
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        <p>
    </p>
        <p>New in Csound version 3.494</p>
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